simplified code across the app and consolidated duplicated helpers

lib/view/pages/talk/data/chat_bubble_styles.dart

@@ -20,7 +20,7 @@ class ChatBubbleStyles {
         ? const Color(0xff182229)
         : Colors.white,
     elevation: 2,
-    margin: const BubbleEdges.only(bottom: 20, top: 10),
+    margin: const EdgeInsets.only(bottom: 20, top: 10),
     alignment: Alignment.center,
   );
 
@@ -30,7 +30,7 @@ class ChatBubbleStyles {
         ? const Color(0xff202c33)
         : Colors.white,
     elevation: 1,
-    margin: const BubbleEdges.only(bottom: 10, left: 10, right: 50),
+    margin: const EdgeInsets.only(bottom: 10, left: 10, right: 50),
     alignment: Alignment.topLeft,
   );
 
@@ -40,7 +40,7 @@ class ChatBubbleStyles {
         ? const Color(0xff005c4b)
         : const Color(0xffd3d3d3),
     elevation: 1,
-    margin: const BubbleEdges.only(bottom: 10, right: 10, left: 50),
+    margin: const EdgeInsets.only(bottom: 10, right: 10, left: 50),
     alignment: Alignment.topRight,
   );
 }